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Allwinner T507 Audio System: DMA Channel, Audio Hub Configuration and Test Guide
- This guide provides an overview of the audio system on the Allwinner T507 platform, including DMA transfer, Audio Hub configuration, and audio testing tools.
- DMA channels are used by sound cards on the Allwinner T507 to transfer audio data between the card and RAM without CPU intervention, enhancing data transfer rates and CPU utilization.
- Key components of the T507 Audio System include the Audio codec, Audio Hub, DMIC, and OWA (One Wire Audio). The Audio codec performs digital-to-analog conversion, while the Audio Hub integrates audio functions and mixing capabilities.
- Users can check the current audio device nodes on the system using commands like 'cat /proc/asound/cards' and 'cat devices'.
- The Audio Hub default configuration and recommended configurations for I2S0 and I2S2 channels are provided for setup purposes.
- Audio channel configurations impact test routines, like playback tests requiring headphones or speakers connected to specific interfaces.
- Testing tools include alsa-utils (amixer, aplay, arecord) that utilize alsa-lib and tinyalsa (tinymix, tinyplay, tinycap) providing basic PCM and control interfaces.
- For audio playback, 'aplay -Dhw:0,0 mic.wav' can be used, and recording using the 8960 external audio chip involves 'tinycap_ahub mic.wav -aD 1 -ad 1 -D 3 -d 0 -t 30 -b 16 -c 2 -p 1024'.
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